【題目】下列說法中不正確的是(

A.溶質(zhì)的分子(或離子)和水分子作用,生成水合分子(或水合離子)的過程放出熱量

B.溶質(zhì)在溶解的過程中,有的放出熱量,有的吸收熱量

C.溶解過程中吸熱過程是溶質(zhì)的分子(或離子)和水分子作用,生成水合分子(或水合離子)的過程

D.有的溶質(zhì)溶解時,擴散過程吸收的熱量小于水合過程放出的熱量,表現(xiàn)為溶液的溫度升高

【答案】C

【解析】

試題分析:物質(zhì)的溶解過程包括溶質(zhì)的分子或離子的擴散過程和溶質(zhì)的分子或離子的水合過程;分子或離子的擴散是吸熱的過程,擴散后分子或離子的水合是放熱過程;當放熱過程大于吸熱過程,溶液溫度升高;當放熱過程小于吸熱過程,溶液的溫度降低;當兩個過程相當時,溶液溫度不變。故A、B、D說法正確,C錯誤。故選C

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